Outage Probability of Dual-Hop CSI-assisted Relay Systems over Rayleigh/Nakagami-m Fading Channels with Interferences at the Relay

摘要

Dual-hop relaying technology is a well-known technique that has a number of advantages when compared to traditional communication networks. This technology is frequently used when the direct link between the source terminal and the destination terminal is in deep fade. Dual-hop transmission systems, depending on the nature and complexity of the relays used for system nodes, can be classified into two dominant categories: regenerative or decode-and-forward (DF) and nonregenerative or amplify-and-forward (AF) systems [1]. Regenerative systems have nodes that use relays when decoding the signal that propagates through the first hop, retransmitting decoded version into the second hop. Nonregenerative systems have nodes with relays which simply amplify and forward the incoming signal to the next node without performing any decoding at all. There are two types of AF relays: channel state information (CSI)-assisted relays and fixed-gain relays. The CSI-assisted relays have variable gain and require knowledge of instantaneous CSI from the previous hop to produce their gain leading to a power control of the retransmitted signal. Fixed-gain relays only require long-term statistics of the channel, which introduce a fixed gain and a variable signal power at the output, but lower complexity compared to CSI-assisted relays [1,2].